DETERMINING SHORT BETWEEN CIRCUITS LOCATION (MS-CAN)

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2014 - Mazda6 - Multiplex Communication System

DETERMINING SHORT BETWEEN CIRCUITS LOCATION (MS-CAN)

CAUTION:

Perform the following malfunction diagnosis only when it is diagnosed with a short between circuits by CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW.

System wiring diagram

Determination procedure

CAUTION:

When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.

When inspecting the DLC-2, touch it with a paper clip or similar thin pin without directly inserting a tester into the terminals.

Disconnect the negative battery cable before performing any work that requires handling of connectors.


Step	Inspection		Action
1	INSPECT BETWEEN CONNECTOR C-35 AND INSTRUMENT CLUSTER FOR SHORT BETWEEN CIRCUITS Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Disconnect connector C-35. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Switch the ignition ON (engine off). Measure the voltage at instrument cluster terminals C and E. Is the voltage at instrument cluster terminals C and E the same?	Yes	Go to the next step.
1		No	Go to Step 3.
2	INSPECT INSTRUMENT CLUSTER FOR SHORT BETWEEN CIRCUITS Switch the ignition off (LOCK). Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Disconnect the instrument cluster connector. Inspect for continuity between instrument cluster terminals C and E (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between the instrument cluster and connector C-35 because the wiring harness is shorted between circuits.
2		No	Replace the instrument cluster because there is a short between circuits in the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
3	INSPECT BETWEEN CONNECTOR C-35 AND AUDIO UNIT FOR SHORT BETWEEN CIRCUITS Switch the ignition off (LOCK). Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Inspect for continuity between audio unit terminals 1O and 1Q. Is there continuity?	Yes	Go to the next step.
3		No	Go to Step 5.
4	INSPECT AUDIO UNIT FOR SHORT BETWEEN CIRCUITS Disconnect the audio unit connector. Inspect for continuity between audio unit terminals 1O and 1Q (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between the audio unit and connector C-35 because the wiring harness is shorted between circuits.
4		No	Replace the audio unit because there is a short between circuits in the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.)
5	INSPECT BETWEEN CONNECTOR C-35 AND SIRIUS SATELLITE RADIO UNIT FOR SHORT BETWEEN CIRCUITS Inspect for continuity between SIRIUS satellite radio unit terminals L and K. Is there continuity?	Yes	Go to the next step.
5		No	Go to Step 7.
6	INSPECT SIRIUS SATELLITE RADIO UNIT FOR SHORT BETWEEN CIRCUITS Disconnect the SIRIUS satellite radio unit connector. Inspect for continuity between SIRIUS satellite radio unit terminals L and K (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between the SIRIUS satellite radio unit and connector C-35 because the wiring harness is shorted between circuits.
6		No	Replace the SIRIUS satellite radio unit because there is a short between circuits in the SIRIUS satellite radio unit. (See SIRIUS SATELLITE RADIO UNIT REMOVAL/INSTALLATION.)
7	INSPECT BETWEEN CONNECTOR C-35 AND CLIMATE CONTROL UNIT OR CLOCK FOR SHORT BETWEEN CIRCUITS Inspect for continuity between climate control unit terminals 1S and 1U. (with full-auto air conditioner) Inspect for continuity between clock terminals E and G. (with manual air conditioner) Is there continuity?	Yes	Go to the next step.
7		No	Go to Step 9.
8	INSPECT CLIMATE CONTROL UNIT OR CLOCK FOR SHORT BETWEEN CIRCUITS Disconnect the climate control unit connector or the clock connector. Inspect for continuity between climate control unit terminals 1S and 1U (wiring harness side). (with full-auto air conditioner) Inspect for continuity between clock terminals E and G (wiring harness side). (with manual air conditioner) Is there continuity?	Yes	Repair or replace the wiring harness between the climate control unit or clock and connector C-35 because the wiring harness is shorted between circuits.
8		No	Replace the climate control unit or the clock because there is a short between circuits inside the climate control unit or the clock. (See CLOCK REMOVAL/INSTALLATION.) (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
9	INSPECT BETWEEN CONNECTOR C-34 AND DLC-2 FOR SHORT BETWEEN CIRCUITS Disconnect connector C-34. Inspect for continuity between DLC-2 terminals L and K. Is there continuity?	Yes	Repair or replace the wiring harness between connector C-34 and DLC-2 because the wiring harness is shorted between circuits.
9		No	Go to the next step.
10	INSPECT BETWEEN CONNECTOR C-34 AND CLIMATE CONTROL UNIT FOR SHORT BETWEEN CIRCUITS Inspect for continuity between climate control unit terminals U and W. (with manual air conditioner) Is there continuity?	Yes	Go to the next step.
10		No	Go to Step 12.
11	INSPECT CLIMATE CONTROL UNIT FOR SHORT BETWEEN CIRCUITS Disconnect the climate control unit connector. Inspect for continuity between climate control unit terminals U and W (wiring harness side). (with manual air conditioner) Is there continuity?	Yes	Repair or replace the wiring harness between the climate control unit and connector C-34 because the wiring harness is shorted between circuits.
11		No	Replace the climate control unit because there is a short between circuits inside the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
12	INSPECT BETWEEN CONNECTOR C-34 AND CONNECTOR C-35 FOR SHORT BETWEEN CIRCUITS Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Switch the ignition ON (engine off). Measure the voltage at rear body control module (RBCM) terminals 3E and 3G. Is the voltage at rear body control module (RBCM) terminals 3E and 3G the same?	Yes	Go to the next step.
12		No	Repair or replace the wiring harness between connector C-35 and connector C-34 because the wiring harness is shorted between circuits.
13	INSPECT BETWEEN CONNECTOR C-08 AND CONNECTOR C-34 FOR SHORT BETWEEN CIRCUITS Switch the ignition off (LOCK). Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Disconnect connector C-08. Connect connector C-34. Inspect for continuity between DLC-2 terminals L and K. Is there continuity?	Yes	Repair or replace the wiring harness between connector C-08 and connector C-34 because the wiring harness is shorted between circuits.
13		No	Go to the next step.
14	INSPECT BETWEEN BSM CONTROL MODULE (LH) AND REAR BODY CONTROL MODULE (RBCM) FOR SHORT BETWEEN CIRCUITS Disconnect the rear body control module (RBCM) connector. Inspect the continuity between BSM control module (LH) terminals C and D. Is there continuity?	Yes	Go to the next step.
14		No	Go to Step 17.
15	INSPECT BETWEEN BSM CONTROL MODULE (LH) AND CONNECTOR C-23 FOR SHORT BETWEEN CIRCUITS Disconnect connector C-23. Inspect the continuity between BSM control module (LH) terminals C and D. Is there continuity?	Yes	Go to the next step.
15		No	Repair or replace the wiring harness between the rear body control module (RBCM) and connector C-23 because the wiring harness is shorted between circuits.
16	INSPECT BSM CONTROL MODULE (LH) FOR SHORT BETWEEN CIRCUITS Disconnect the BSM control module (LH) connector. Inspect for continuity between BSM control module (LH) terminals C and D (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between the BSM control module (LH) and connector C-23 because the wiring harness is shorted between circuits.
16		No	Replace the BSM control module (LH) because there is a short between circuits in the BSM control module (LH). (See BLIND SPOT MONITORING (BSM) CONTROL MODULE REMOVAL/INSTALLATION.)
17	INSPECT REAR BODY CONTROL MODULE (RBCM) FOR SHORT BETWEEN CIRCUITS Inspect for continuity between rear body control module (RBCM) terminals 3E and 3G (wiring harness side). Is there continuity?	Yes	Repair or replace the wiring harness between the rear body control module (RBCM) and connector C-08 because the wiring harness is shorted between circuits.
17		No	Replace the rear body control module (RBCM) because there is a short between circuits in the rear body control module (RBCM). (See REAR BODY CONTROL MODULE (RBCM) REMOVAL/INSTALLATION.)

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